Assuming that:
Different types of memberships = different User Roles
You can simply apply some conditional logic to achieve this:
function disable_rss_conditionally() {
// First let's check if the user is logged in
// you can use current_user_can() to pass to forbidden roles
if (! is_user_logged_in() || current_user_can( 'subscriber' ) ) {
// you can also use wp_die( __( 'Some message'));
wp_redirect( home_url(), $status = 404 );
}
}
add_action('do_feed', 'disable_rss_conditionally', 1);
add_action('do_feed_rdf', 'disable_rss_conditionally', 1);
add_action('do_feed_rss', 'disable_rss_conditionally', 1);
add_action('do_feed_rss2', 'disable_rss_conditionally', 1);
add_action('do_feed_atom', 'disable_rss_conditionally', 1);
add_action('do_feed_rss2_comments', 'disable_rss_conditionally', 1);
add_action('do_feed_atom_comments', 'disable_rss_conditionally', 1);